Angular blade grinder



Sept. 20, 1932.

P. .T. LENNON ANGULAR BLADE GRINDER Filed June 24. 1927 3 Sheets-Sheet 1 INVE 0 g k T'ZQWM ATTORNEYS p 20, 9 P. T. LENNON 'ANGULAR BLADE GRINDER Filed June 24,1927

' INVENTOR v r W ATTORNEYS Sept. 20, 1932. P. T. LENNON 1,877,913

ANGULAR BLADE GRINDER Filed June 24, 1927 3 Sheets-Sheet 3 Farr/ WK Tie/mom glwuentoz Patented Sept. 20, 1932 UNITED: STATES rn-rnrox 'r. LENNON, or cLEvELAN'D, OHIO ANGU'LAR BLADE GRINDER" Application filedJ'une 24,

This inventionrelates to mechanism for cutting or grinding multi-bladed cutters, such as reamers and the like. l

M1 Reamers are in extensive use in which the cutting edges or blades extendlongitudinally of theireamer buta-re disposed, in angular non-parallel relation to the axis thereof. ,In the formation of reamers of this type it is customary to provide the reamer with an even stock and another post 12 is carriedby the. bed of the-fixture-or the footstock in transnumber of equally spaced cuttingv edges, in-

clined at the sameangle -to a plane normal to the axis of the'reamer. While the spacing for the blades or reamers having the same number of blades is the same, the angles at 1 "which these blades are disposed varieswith dlfferent makes, and even in different slzed reamers of the same make. Thls glves rise,

in providin an apparatus for forming-or Msharpening the cuttin blades .which will pro- 0"vidc them, with ara ialrclearan ce on their outer surface,ito many difficulties which do not arise in sharpening reamers having blades parallelto their. axes. ;1 v n By applications of my invention, Iam able to use one apparatus for grinding or otherwise sharpening any reamer having inclined blades, irrespective of the angle at which the blades are inclined. The invention will be better understood from the description of one practical embodiment thereof, illustrated in the accompanying drawings, in which Figure 1 is a side elevation ofa fixture'cm-- I bodying the invention, parts being shown broken away and in section, designed for use u on a 'rinder and f Z3 7 Figure 2 1s a transverse viewfof the apparatus shown in Figure 1 taken on line IIII thereof. 1 v v, Fig. 3 is a plan view i-llustratingthe relation between the cutter head and blades.

The fixture comprises a bed-1 supported on trunnions 2 of brackets 3 which are bolted or otherwise suitably attached to ,the table'l of a grinder. The bed carries a stationary headstocku5 and an adjustable footst'ockfi, longitudinally aligned therewith, with their axes parallel to that of'agrinding wheel? carried by the usual mechanism of'the grinder; The

, headstock is providedwith a hollow bushing 8, in which the shank of thereamer, or a 001- 1927. Serial No. 201,061.

let, or the like, receiving-theshank thereof,

may. be received and the footstock is'provided with an adjustable dead center 9 for support. ing the other end thereof. Means, shown in the drawings as a pulley 10, are provided for j rotating the bushing in the. headstock, and through it the reamerbeing sharpened.v A stationary post 11 is attached tothe table of v the grinder adjacent the inner end of the footverse alignment with the firstmentioned post, the upper ends of the two being connected by a tension spring 13, the :tension of which tends to rock the bed, and all parts supported thereon toward thegrinding wheel. I The fixture is maintained in its normal position away from the grinding wheel by a cam 14 carried bythe bushing of the headstock. The cambearsagainst a rod 15 sup- 9-. ported in a manner to be hereinafter described which in turn is supported by a curved shoe -16 adjustably carriedbythe stationary post, and, therefore, when the rod 15 is in: terposedbetween one of the higher-portions of the cam and the shoe the headstock is maintained in its normal position, irrespective of whether the portion of the rod interposed between the cam'and shoe is in the horizontal plane through the center of the headstock, above, or below this plane. This is essential to produce an accurate cutting edge on the cutter, which shall lie in the sur-' face of a true cylinder, particularly when the blades of the cutter areangularly disposed and the rod is, therefore, inclined so that upon movement of the grinding wheel along the cutter 'blade'sections of the rod in differ part of the grinder.

respect to the grinding wheel as by being mounted upon the bed or other stationary The supporting arm may be moved longitudinally along the rod and secured in any position thereon as by split collars 22. The cam has its greatest diameter at points corresponding to the cutting edges of the blades of the reamer, and the diameter decreases immediately beyond these points so that the fixture will be rocked to- 7, ward the grinding wheel by the spring assoon as the wheel passes beyond thecutting edge of a blade, and will grind the peripheral surface with a radial clearance preferably in a convex form. 7

Before the cutting operation is commenced the yoke 17 is adjusted so that the rod is disposed at' the same angle to the axis of the reamer as the cutting blades. If, therefore, the reamer is so adjusted that the cam bears against the rod at the cams maximum radius when the grinding wheel is at the cutting edge of a particular blade, then, as the fixture and grinding wheel are relatively moved lonquires no attention after having been adjusted for a given angularity of 'blade. N0 indexing for successive blades is required, but as the reamer revolves continuously, increments of each blade are successively ground as they pass the grinding wheel, each incre ment having the desired radial clearance. 1

Obviously, when the rod 15 is horizontal, the apparatus canbe used to grind reamers having blades parallel to their axes, and by the-use of suitable cams, it may be used for reamers having any number or spacing (regular or irregular) of blades.

' While I have described the illustrated em bodiment of my invention in some particularity,'obviously many modifications and variations thereof will readily occur to those skilled'in the arttowhichit appertains, and I do not, therefore, limit myself to the precise details illustrated and described, but claim as my invention all embodiments, variations,

and modifications thereof coming within the scope of the subjoinedclaims.

I claim: I lIFeeding'mechanism fora cutting machine'ha'ving arotating cutter and a table translatable axially past the same, which comprises arotatable holder for an article being cut, amovable support therefor mount.- ed on said table, means urging the support to-;

ward the cutter, a cam fixed to the holder to rotate therewith, a stop engaging the camto supporting jtable translatable with respect thereto, which comprises a rotatable work holder, a movable support therefor mounted on said table, resilient means urging the support toward the cutter, a cam carried by the holder to rotate therewith and limit the movement of the support toward the cutter, an arcuate guide carrie-dby the table and stationary relative thereto, a roller interposable between the guide and cam to limit themovement of the support toward thecutter, and a roller support adjustably carrying the roller and carried by a part of the mechanism stationary relative the cutter. 7 V

3. Feeding mechanism for a cutting machine having a rotating cutter and a table" translatable relative thereto, which comprises a rotatable holder for an article being cut, a movable support therefor mounted on said table, means urging the support toward the cutter, a cam carried by the holder to rotate therewith, an inclined adjustable stop en- 7 gaging the cam to limit the movement of the 2 3 support toward the cutter, an adjustable sup port for said stop pivotally carried by a stationary portion of the mechanism, and a statirrliary abutment for the stop carried by the ta e.

4. A fixture for use in conjunction with a grinding machine, which comprises trunnions attachable to the table of the grinding machine, a bed extending longitudinally of said table supported on said trunnions, supports on the bed for a multi-bladed cutter, resilient means rotating the bed about its trunnions toward the grinding wheel of the machine, a cam carried by the bed and rotated by the rotation of the supports, a stop carried by the grinding machine and engaged by the cam to limit the rotation of the bed toward the grinding wheel, the stop being angularly adjustable so that it contacts the cam indifferent horizontal planes as the table moves relative the grinding wheel.

5. A fixture for use' on a grinding machine, which comprises trunnions attachable to the table of the machine, a bed extending longitudinally of thetable and supported by the trunnions, supports carried by the bed for a multi-bladed cutter, resilient means rotating the bed toward the grinding wheel of the grinder, a cam carried and'rotated by the support,astop engaged by thecam to limit the rotation of the bed toward the grinding wheel, a support for thestop carried by the grinding machine and stationary relative the grinding wheel, the stop being angularly adjustable so thatits positionof contact with,

the cam varies as the table moves. relative A trunnions, supports on the bed for a multibladed cutter,,resilient means for rotating the bed toward the grinding wheel of the grinder, a cam carried and rotated by rotation of the cutter, a fixed curved shoe carried by the table adjacent the cam, an angularly adjustable rod interposed between the cam and shoe and carried by a part of the grinding machine stationary relative the grinding wheel.

7. A fixture comprising trunnions attachable to the reciprocating table of a grinding machine, a bed extending longitudinally of the table supported on-said trunnions, a work support on the bed, a cam rotated by rotation of the vvork, a fixed curved shoe carried by the table adjacent the cam, resilient means moving the bed toward the grinding Wheel of the grinder and said shoe, a rod interposed between the cam and shoe and angularly adjust-,

able in a plane transverse to the radius of con tact with the cam. v I 8. A fixture for use with grinding ma- I chines, comprising a bed adapted to be pivotally attached tothe movable table of a grinding machine, a headstock and a footstock carried by said bed, a .cam rotated by the spindle of one of said stocks, a curved shoe carried by the table and stationary relative thereto, an angularly adjustable stop interposed between said shoe and cam and carried by a part of the machine stationary relative the grinding wheel, and means for moving said table toward said shoe and grinding Wheel.

9. A fixture for use with grinding machines, which comprises a bed adapted to be pivotally supported upon the movable table of a grinding machine, a headstock and afootstock supported by said bed, a spring moving said bed toward said grinding wheel, means for rotating the spindle of the headstock, a cam carried by said spindle, a curved shoe carried by the table on the side adj acentthe grinding wheel of the machine and adjacent said'cam, and a rod interposed between. the" cam andv shoe and adj ustably carried by a support pivoted upon the bed of the grinding mac signature this 16th dayof June, 1927 PATRICK T. LENNON.

hine. r. d In testimony whereof I-hereunto affix my 

